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a. log 4 = log 2^{2}
= 2 x log 2
= 2 x 0.3010
= 0,6020
b. log 5 = 0,6990
log 200 = log ( 2 pangkat 3 x 5 pangkat 2 )
= log 2 pangkat 3 + log 5 pangkat 2
= (3 x log 2) + (2 x log 5)
= 3 x 0,3010 + 2 x 0,6990
= 0,9030 + 1,3980
= 2,3010
c. 0,004 = log 2 pangkat 2/1000
= 2 x log 2 - log 1000
= 2 x 0,3010 - 3
= 0, 6020 - 3
= - 2,2980